I dont know if thats been discussed before and I'M not going to use the FSE as its not a question but just something I read.
A lot of work by Jiro Tsuji has been done on palladium chloride.
He states and I quote
"Usually, cupric chloride is used as reoxidant, but we found that cuprous chloride is preferable because cupric chloride tends to chlorinate ketones"
end of quotation. I think it goes in the sense of some reading I have done lately where you want to have as less chloride ions as possible
Tetrahedron letters, 34, 2975-2976, 1976